<?
/*
 *  GGB - Gelin's Guest Book.
 *  Copyright (C) 2006  Denis Nelubin aka Gelin
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *  http://gelin.ru
 *  mailto:den@gelin.ru
 *
 *  Description:    Global widely used functions.
 *
 *  History:
 *  2006-06-25  Gelin   Initially created.
 *
 */

/**
 *  Tryes to get parameter from GET, POST requests and from session.
 *  If many sources includes requested parameter, this precedence is used:
 *  parameter from GET request overrides parameter from POST request,
 *  which overrides parameter from session.
 *  @param  $paramName   name of parameter
 *  @return parameter value, may be undefined
 */
function getParameter($paramName) {
    $result = $_GET[$paramName];
    if (!isset($result)) {
        $result = $_POST[$paramName];
    }
    if (!isset($result)) {
        $result = $_SESSION[$paramName];
    }
    return $result;
}

?>